Lithium for Bipolar DisorderWhy It’s Still Used & How It’s Monitored

Lithium sometimes surprises people. It’s a simple element, it’s been used in psychiatry for decades, and yet it remains one of the most important medications for bipolar disorder. If your psychiatrist has suggested lithium for bipolar disorder, you probably have questions about why it’s still used, what the side effects are, and why it needs regular blood tests. This guide answers those questions and explains what day-to-day life on lithium looks like.

Why Is Lithium Still Used for Bipolar Disorder?

Lithium is still used for bipolar disorder because it’s one of the best-studied mood stabilizers for preventing both manic and depressive episodes, and it has evidence for reducing suicide risk that few other psychiatric medications share. It’s often considered for long-term maintenance, especially for people with classic bipolar I and a history of full manic episodes.

Bipolar disorder is a serious condition to leave untreated. According to the National Institute of Mental Health, an estimated 2.8% of U.S. adults had bipolar disorder in the past year, and 82.9% of them had serious impairment. Preventing future episodes is a central goal of treatment, and that’s where lithium’s long track record matters.

What the Evidence Shows About Lithium and Suicide

The evidence shows that lithium is associated with lower suicide rates in people with mood disorders, although the size of the effect is still debated. A BMJ meta-analysis of 48 randomized trials with 6,674 participants found that lithium was more effective than placebo in reducing suicides, with an odds ratio of 0.13, and in reducing deaths from any cause, with an odds ratio of 0.38.

Those confidence intervals are wide, because suicide is thankfully rare in trials, and later research has added nuance. A 2022 meta-analysis in BJPsych Open noted that controversy remains about how strongly lithium prevents suicide, partly because a large veterans trial didn’t show a benefit. The fair summary is that lithium has the strongest evidence of any mood stabilizer for this outcome, and it’s one reason psychiatrists still value it.

Why Lithium Blood Levels Matter

Lithium blood levels matter because the difference between a dose that works and a dose that causes toxicity is narrower than with most medications, so regular blood tests guide the dose and keep it safe. Blood is usually drawn about 12 hours after the last dose, and levels are checked more often when starting, after dose changes, and when other medications change.

Several things can raise lithium levels unexpectedly: dehydration, heavy sweating, vomiting or diarrhea, a very low-salt diet, and some common medications, including certain blood pressure drugs and over-the-counter anti-inflammatory pain relievers such as ibuprofen. Tell your psychiatrist and pharmacist about any new medication, and ask before taking over-the-counter pain relievers.

Lithium asks for more monitoring than many medications. For many people, what it gives back is worth it.

Common Lithium Side Effects

Common lithium side effects include increased thirst and urination, a fine hand tremor, mild nausea, weight gain, and feeling a bit slowed, and many of these ease with time or dose adjustments. Taking lithium with food, spreading doses out, or using an extended-release form can help some people.

Signs of lithium toxicity are different and need prompt attention: worsening tremor, confusion, unsteady walking, slurred speech, severe nausea, vomiting, or diarrhea. If these appear, contact your psychiatrist right away or seek urgent care. Knowing the difference between everyday side effects and warning signs is part of taking lithium safely.

Lithium Kidney and Thyroid Monitoring

Lithium kidney and thyroid monitoring is a routine part of care, because over time lithium can affect how the kidneys handle water and can reduce thyroid function in some people. Both are usually manageable when caught early.

1. Baseline tests. Kidney function, thyroid function, and other labs are checked before starting.
2. Frequent early levels. Blood levels are checked more often in the first weeks and after dose changes.
3. Regular ongoing checks. Once stable, levels, kidney function, and thyroid function are checked periodically.
4. Medication reviews. New prescriptions and over-the-counter drugs are checked for interactions.
5. Symptom check-ins. Side effects, mood, and any warning signs are reviewed at each visit.

If thyroid levels drop, thyroid hormone replacement is often enough, and lithium can continue. If kidney function changes, your psychiatrist may adjust the dose, review other medications, or discuss alternatives. Regular monitoring is what makes long-term use safer.

Mood Stabilizer Maintenance: Is Lithium Right for You?

Whether lithium for bipolar disorder is right for your mood stabilizer maintenance depends on your type of bipolar disorder, past responses to treatment, other health conditions, and how you feel about regular blood tests. Alternatives include other mood stabilizers and certain atypical antipsychotics, and the choice is shared.

Lithium tends to be considered when full manic episodes are prominent, when suicide risk is a concern, or when other medications haven’t worked. It’s used with more caution in people with kidney disease and requires specific planning around pregnancy. Our overview of the types of bipolar disorder explains how the diagnosis shapes treatment, and our guide to bipolar II vs depression covers why getting the diagnosis right matters. Never stop lithium suddenly; stopping abruptly can increase the risk of relapse. If you’re having thoughts of suicide, call or text 988 in the US.